<template>
  <div class="mapBox">
    <div class="map" id="canvasMap">
      <div class="title">Canvas</div>
    </div>
    <div class="map" id="webglMap">
      <div class="title">WebGL</div>
    </div>
  </div>
</template>

<script  setup>
import { onMounted, onBeforeUnmount } from "vue";
import { Map, View } from "ol";
import { Tile as TileLayer, WebGLTile } from "ol/layer";
import { defaults, FullScreen } from "ol/control";
import { XYZ } from "ol/source";
import { ATTRIBUTIONS } from "../../constants";

let canvasMap = null;
let webglMap = null;
const initMap = () => {
  //加载canvas渲染模式的地图做为主图,默认是canvas渲染模式
  canvasMap = new Map({
    layers: [
      new TileLayer({
        source: new XYZ({
        //   attributions: ATTRIBUTIONS,
          url: "http://t0.tianditu.com/DataServer?T=vec_w&x={x}&y={y}&l={z}&tk=3bc6874f2b919aa581635abab7759a3f",
          wrapX: false,
        }),
      }),
      new TileLayer({
        source: new XYZ({
        //   attributions: ATTRIBUTIONS,
          url: "http://t0.tianditu.com/DataServer?T=cva_w&x={x}&y={y}&l={z}&tk=3bc6874f2b919aa581635abab7759a3f",
          wrapX: false,
        }),
      }),
    ],
    target: "canvasMap", //地图容器div的ID
    view: new View({
      center: [12723048, 3575638], //地图初始中心点
      minZoom: 2,
      zoom: 6,
    }),
    //加载控件到地图容器中
    controls: defaults().extend([
      new FullScreen(), //加载全屏显示控件（目前支持非IE内核浏览器）
    ]),
  });

  webglMap = new Map({
    layers: [
      new WebGLTile({
        source: new XYZ({
        //   attributions: ATTRIBUTIONS,
          url: "http://t0.tianditu.com/DataServer?T=img_w&x={x}&y={y}&l={z}&tk=3bc6874f2b919aa581635abab7759a3f",
          crossOrigin: "anonymous",
          wrapX: false,
        }),
      }),
      new WebGLTile({
        source: new XYZ({
        //   attributions: ATTRIBUTIONS,
          url: "http://t0.tianditu.com/DataServer?T=cva_w&x={x}&y={y}&l={z}&tk=3bc6874f2b919aa581635abab7759a3f",
          crossOrigin: "anonymous",
          wrapX: false,
        }),
      }),
    ],
    target: "webglMap", //地图容器div的ID
    view: canvasMap.getView(), //设置为主图的视图对象
    //加载控件到地图容器中
    controls: defaults().extend([
      new FullScreen(), //加载全屏显示控件（目前支持非IE内核浏览器）
    ]),
  });
};
onMounted(() => {
  initMap();
});

onBeforeUnmount(() => {
  if (canvasMap) {
    canvasMap.dispose();
    canvasMap = null;
  }
  if (webglMap) {
    webglMap.dispose();
    webglMap = null;
  }
});
</script>

<!-- Add "scoped" attribute to limit CSS to this component only -->
<style scoped>
.mapBox {
  height: 100%;
  display: flex;
  justify-content: space-around;
  flex-direction: column;
  padding: 20px;
  box-sizing: border-box;
}
.map {
  position: relative;
  width: 100%;
  height: 48%;
  border: 2px dashed red;
  box-shadow: 0 0 10px #000;
}
.title {
  width: 200px;
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  color: red;
  text-align: center;
}
</style>